High-draft system for spinning machines



March 3, 1931. F. BROCH 1,794,578

HIGH DRAFT SYSTEM FOR SPINNING MACHINES Filed Aug 10, 1928 F591 Fig.3

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Applicatlonflled August 10,1928, serial no. 298,856, and in Austria au ties, 1927. Y

In hi h draft systems forspinning machines t e pressure on the rove (rovin or sliver) when passing between the retar ing or gripping rollers ought to be very small in order to prevent deterioration of those fibres draft systems both these conditions are metby making the top (pressure) roller of the gripping rollers of small diameter and of very small weight. This light roller is rotated by friction partly on the roving and partly on its co-acting bottom roller and therefore its speed is varying to a considerable extent, as the circumferential speed'of said roller is dif- :0 ferent from the velocity of the rove or sliver. From this fact inconveniences result for the stretchin process, all the more, as all the accidental orces, to whichthe entire machine may be exposed, such as for instance mechanical shocks, are also imparted to the said light roller.

For doing away with these drawbacks it has already been proposed to have the said light top roller driven from its lower roller [0 by means of a gearin but in practice this way has not proved qulte satisfactory.

The cause of the unreliable working of the light top gripping roller is its little inertia corresponding to its small weight. 'But in- 5 creasing the resistance due to inertia will only lead to success, if thereby the pressure is not augmented, to which the roving isexposed.

According to the present invention this problem is solved by loading the top roller in I uestion at a point distant from the roving so t at the roller will take up a position oblique to its lower or bottom roller and will only run on an edge of the latter, or else-by way of an equivalent arrangementits one edge will 5 run on the mantle surface of the lower roller. The pressure, exercised by the roller on the roving, will thus depend upon the load of the roller, upon the distance of the point, where the roller is'supported from the force acting 0 on the axle of the roller and upon the distance of the said supporting I oint from the pressure point (rovm ably choosing or as greater load e pressureto any desired deree. As thus the pressure roller can be subected to a high load and its inertia-resistance ,ing ensured thereby. A further improvement of the device consists in positively driving the'upper roller by providing it and, if desired, also the lower-roller with teeth, flutes,

grooves or the like which thus obviously con stitute a gearing.

In the annexed drawing five embodiments of the invention are illustrated by way of ex-' amples, the Figures 1 and 2 showing the first one by a partly sectional elevation and by a plane view respectively, Figure 3 an elevation of the second, the Figures 4, 5 and 6 partly sectional elevations of further modifications and Figure 7 a plane view of the device shown by Figure 6. Inpractice symmetrically arranged pairs of such devices are generally employed, but in the drawing the single devices are shown only.

In Figure 1 the top or pressure roller is marked 1 its axle 2 and the lower cylinder 3, the top roller 1 being constituted by a tubelike friction bush provided on its one end with I onsequently by suitustmg these distances the 'POSSlbllltY is given of reducing even with a an inwardly projecting collar 4, which serves as bearing or guide for the axle 2. A guide for the journal 5 at the other end of the bush and also for the corresponding end of the axle 2 is constituted by a suitably s aped member 8 provided with the recesses 6 and 7, which recesses allow the ends of the bush and of the axle to perform a slight vertical movement vided with journals 12 and 13 respectively aud, if desired, also loaded for instance by a weighted arm 2. v The top roller 1 will under these conditions take up a position obli no to the lower nipping roller, this obliquity eing exaggerated in the drawing.

If P is the component acting on the collar 4 of the force exercised by the'load of the axle, the pressure I) exercised on the roving L is to be stated from the equation P.a.=D.b, wherein ais the distance of theforce from the supporting edge and b the distance of the centre line of the roving from said ed e.

The distance of the collar 4 from t e supporting edge ought to be small in order to augment the friction pressure, by which the top roller engages with the lower roller. By providing grooves 10 at the place, where the rollers engage, (Figure 3) their engagement can be made moreeffective. Instead of the grooves little teeth 10 (Figure 1) may be provided or any other equivalent means ensuring the engagement ofthe two rollers.

In the embodiment as shown by Figure 4 the pressure roller 11 is on both its ends pr}?- t e journal 12 turning in the normal recess of the so-called bearing bar, whilst the journal 13 is guided by a claw 14 carried either by the front roller or by the back roller. The excentrical load is obtained by the roller 11 being partly hollow, so that its centre of ravity lies a distance apart from the middle of the .roller. Also in this case there exists the relation Ra. =D.b, wherein P is the weight of the pressure roller 11.

The same effect as with a hollow'roller may be obtained with a full roller (Figure 5) when the latter is composed of two parts 15 and 16 of different specific wei ht.

Also the pressure ro ler shown in Figures 6 and 7 consists of two parts 17 and 18 and in addition thereto is-similarly to the top roller of Fig. 4-for part of its length hollow. The journal 19 is provided on part 17 having a hollow space and the journal 20 on part 18', which in this case has the form of a bush inserted into the hollow space of part 17. The bush 17 is at the place, where it runs on the edge of the bottom. roller provided with flutes, the edges of which flutes form teeth 10a such as are also seen in-Figs. 1 and 2. As thebottom roller is also flutedto its entire length for ensuring a better adhesion or gripping of the sliver, the teeth 10a of the top roller will engage with the teeth formed by the flutes of the bottom roller, thus constituting means for positively driving the top roller.

What I claim is: v V

1. In a high draft system for spinning machines of the type having a plurality of pairs of drawing rollers, wherein one roller of one pair of said rollers constitutes a gripping roller and is weighted near one end thereof and mounted on top of the lower roller in such a manner that the roving therebetween causes the top roller to assume a position obli ue to the lower roller so that the weighte end thereof runs on the adjacent end of the lower (roller to be driven thereby. 2. In a high draft system for spinning machines of the type having a pluralit of airs of drawing rollers, wherein one rol er 0 one pair thereof constitutes a gripping roller and is weighted near one end thereof and mounted on top of the lower roller in such manner that the roving therebetween causes the top roller to assume a position oblique to the lower roller so that the weighted end thereof runs on the adjacent end of the lower roller and 1s driven thereby, the said top gripping roller being in the form of a bush provided with a guide near its one end and providing a clearance so, that it is capable of assuming the oblique position.

3. A high draft system for spinning machines of the t pe having a plurality of pairs of drawing ro lers, wherein one roller of one of said pairs constitutes a gripping roller ,weighted near one end thereof and mounted on top of the lower roller in such manner that the roving therebetween causes the top roller to assume a position oblique to the lower roller so that the wei hted end thereof runs on the adjacent end 0 the lower roller to be driven thereby, the said top gripping roller being in the form of a bush, an axle projecting through the bush and an inwardly pro ecting collar on one end of the bush and providing .aclearance about the axle so that the said bush is capable of assuming the oblique position.

4. In a high draft system for spinning machines of the type having a plurality of pairs of drawing rollers, wherein one roller of one of said pairs constitutes a gripping roller weighted near one end thereof and mounted ontop of the lower roller in such manner that the roving therebetween causes the top roller to assume a position oblique to the lower roller and the weighted end thereof running on the adjacent end of the lower roller to be 5. In a high draft system for spinning ma-.

chines of the type havin a drawing ap aratus embodying a draw ba r and a plurality of pairs of drawing rollers, wherein one roller of one of said pairs of rollers constitutes a i Y gripping roller weighted near one end thereof and mounted on top of the lower roller in such manner that the roving therebetween causes the top roller to assume a position oblique to the lower roller so that the weighted end thereof runs on the adjacent end of the lower roller to be driven thereby,-

an axlefor the roller, the said top gripping roller being in the form of a bush and mounted on the axle, and a guiding member for the bush as well as for the axle mounted in the bearing bar of the drawing a paratus.

6. In a high draft system or spinning ma chines of the type having a plurality of pairs of drawing rollers, wherein one roller of one of said pairs of rollers constitutes a gripping roller having its center of gravity situated near one of its ends andmounted on top of the lower roller in such manner that the roving therebetween causes the top roller to assume a position oblique to the lower roller, and the heavier end of the top roller running on the adjacent end of the lower roller to be driven thereby.

7. In a high draft system for spinning machines of the type having a plurality of pairs of drawing rollers, wherein one roller of one of said pairs constitutes a gripping roller which at one end is hollow for art of its length and is mounted on top 0 the lower roller in such manner that the roving therebetween causes the top roller to assume a-position oblique to the lower end, and the heavy end of' the top roller running on the adjacent end of the lower roller to be driven thereby.

8. In a high draft system for spinning machines of the t pe having a plurality of pairs of drawing ro lers, wherein one roller of one of said pairs of rollers constitutes a gripping roller composed of two parts, each of which is provided with a journal and has the form of a bush, the bush of one part being inserted into the bush of the other part, and one of said parts being heavier than the other and said top gripping roller being mounted on top of the lower roller in such manner that the roving therebetween causes the top roller to assume a position oblique to the lower roller and arranged so that the heavier partof the top roller runs on the adjacent end of the lower roller to be driven thereby.

9. In a high draft system for spinning machines of the type having a plurality of pairs of drawing rollers, wherein one roller of one of said pairs of rollers constitutes a gripping roller loaded near one end thereof and mounted on top of the lower roller in such manner that the roving therebetween causes the top roller to assume a position oblique to the lower roller and said loaded end thereof running on the adjacent end of the lower roller to be driven thereby- 7 10. In a high draft system for spinning weighted end of the top roller and the-adjacent bottom roller being fluted so that they engage each other in the manner of a gearing. In testimony whereof I have signed my name to this specification.

FRIEDRICH BROCH.

' machines of the type having a plurality of I pairs of drawing rollers, wherein one roller of one of saidpairs of rollers constitutes a gripping roller weighted near one end thereof and mounted on top of the lower roller in such manner that the roving therebetween causes the top roller to assume a position oblique to the lower roller, the said weighted end thereof running on the adjacent endof the lower roller to be driven thereby, and the 

